On my Edge 820, the total climb is always wrong. In looking at the topographic plot, it is clear that every time the device pauses, there is a drastic drop in the elevation. Then once I start riding, the elevation corrects, and it gives me the difference as a climb. It does seem that the magnitude of the drop correlates with the duration of the break. When I say break, I mean at most a 30 minute meal break, not anything overnight.
Here is a good example. Look at miles 20, 25, 35 and 50:
It took me a while to figure out what was going on, but looking back at old rides, it is clear that this has been happening forever. In trying to trouble shoot this, I update the Edge to the latest software, and I complete a full factory reset. This issue persists even after a factory reset with the default settings.
Any ideas what's going on here? More importantly, any way to fix it??